Best Brake Fluid

6 Best Brake Fluid (Review)

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Inspecting the brakes on your car should be a necessary car maintenance routine. It is an excellent idea to adopt as safety is an important thing to put in mind when driving. Now, most drivers have no idea about the kind of brake fluid they should use for their cars.

The right brake fluids are things that every driver should be well familiar with because just as we have a variety of quality oils and car accessories, there are also different types of quality brake fluid.

Castrol 12509 Dot 4 Brake Fluid (12 Oz)
Motul MTL100949 8068HL RBF 600 Factory Line...
Castrol 12614 Dot 4 Synthetic Brake Fluid
Castrol 12509 Dot 4 Brake Fluid (12 Oz)
Motul MTL100949 8068HL RBF 600 Factory Line Dot-4
Castrol 12614 OIL
Castrol 12509 Dot 4 Brake Fluid (12 Oz)
Castrol 12509 Dot 4 Brake Fluid (12 Oz)
Motul MTL100949 8068HL RBF 600 Factory Line...
Motul MTL100949 8068HL RBF 600 Factory Line Dot-4
Castrol 12614 Dot 4 Synthetic Brake Fluid
Castrol 12614 OIL

You have to find a way to get the best brake fluid on the market. The truth is that there is no shortcut to that except you equip yourself with the right information. it is what this post is all about.

So, we have come up with information on different kinds of brake fluids and the vital role they play in your car’s brake system.

1. Castor 12509

Castor 12509

It is quite an inexpensive and reliable product from a known brand like Castrol. This brake fluid has most of the DOT 4 features, and there is also the presence of the unique qualities that is responsible for the performance boost of this product.

This product is quite suitable for high-performance cars because it offers a top braking response and will easily mix with other brake fluids. It doesn’t matter whether you use conventional or modern brake fluid, Castor 12509 brake fluid will work perfectly with it.

The brake fluids work very effectively with high-temperature braking systems as a result of wet and dry boiling points that ensure high performance. Although the quantity of the fluid is small, it is one of the cheapest on our list.


Key Features

  • Great performance 
  • Fit for racing cars
  • Durable and reliable
  • Highly economical
  • Mixes with other fluids
  • Average boiling point

2. Motul MTL 100949

Motul MTL 100949

It is another brake fluid from Motul that is a completely non-silicon synthetic fluid that has been one of the tops for customers. With its high boiling point over other brake fluids, it is quite sufficient for different purposes. 

Aside from the fact that it keeps the brake away from corroding or rusting, it is also the ideal brake fluid for the clutch system and hydraulic actuated brakes. The brake fluid offers the brake system excellent stability and exceptional thermal resistance; this will make the fluid able to stand on its tag. 

Although the quantity is a bit small, the vapor-lock feature of the fluid keeps your brake system from corrosion, which is still quite enough for different purposes. If you compare the quantity of fluid in the bottle to the price this fluid is offered, you may want to say that it is relatively pricey. However, the quality of performance it offers your car’s braking system will make you take your mind off the price.  


Key Features

  • Very high boiling point
  • Exceptional aerodynamic performance
  • It has total stability and extreme thermal resistance.
  • Recommended for high-performance vehicles
  • It is not silicon-based.
  • Small quantity

3. Castrol 12614 

Castrol 12614

This is one of the best DOT 4 brake fluids from one of the leading brands in the market. Castrol has released into the market millions of top-quality products that have incredibly satisfied a lot of customers around the world.

This brake fluid comes with DOT 3 and 4 specifications made up of polyglycerols. This fluid is highly recommended for high-performance vehicles and works best for any kind of temperature.

The fluid helps in increasing the applied force, and because of its high performance and rich composition, it also delivers swiftly when you use the brakes. Apart from swift movement, you can also have a blend of different brake fluids, all mixed for better performance.
Although this product does not fit for vehicles that are always on the move, for a highly efficient car, it is just the perfect fluid.

When it comes to price, this brake fluid is reasonably priced compared to the amount of fluid in the bottle.


Key Features

  • Combines effortlessly with other fluids
  • Give a lasting satisfaction.
  • Compatible with high temperature
  • Comes with DOT 4 specifications

4. Wilwood 290-6209 Plus Brake Fluid

Wilwood 290-6209 Plus Brake Fluid

Want to give your car something way beyond the expected standard of SAE and DOT fluids? If your answer to that is YES, then the Wilwood 290-6209 is just the perfect fluid for your brake system.

With this brake fluid’s high, dry, wet boiling point, and temperature endurance, this fluid is ideal for racing cars. The fluid is water-resistant, and the air that builds up in the brake system prevents it from corrosion and abrasion.

Although the fluid is not advisable for non-racing cars, and the quantity is relatively small for the payment, the brake fluid can provide lubrication and power for the driver to enjoy.


Key Features

  • Very high boiling points 
  • Top-notch quality
  • Water absorbent
  • Great for lubrication
  • Recommended for racing cars
  • Small quantity 

5. ATE 706202 Racing Brake Fluid 

ATE 706202 Racing Brake Fluid

Are you a driver looking for a top-notch brake fluid that will be perfect for your race car? So this product from ATE is just the ideal brake fluid for you.

This brake fluid gives your vehicle’s brake system the power to brake swiftly, especially hydraulics, to ensure that the user gets the steadiest braking service. Apart from the excellent braking service, the fluid also has excellent water-holding capabilities and also makes sure that the boiling point collects for maximum flow.

The brake fluid recommends for its commendable boiling point and protection against corrosion in the brake system.


Key Features

  • Prevents corrosion 
  • Great water-locking features
  • Long lifespan
  • Excellent steam bubble tolerance
  • Non-foaming features for swift filling and bleeding

6. Castrol SRF 12512 Racing Brake Fluid

Castrol SRF 12512 Racing Brake Fluid

This is an expensive and high-end synthetic racing fluid that exceeds the specifications of both DOT 3 and 4 made to last for a long time. 

The brake fluid comes with a wet boiling point of about 270 degrees, a dry boiling point of 310 degrees, and extremely high boiling points. With the anti-vapor lock feature, the vapor will be kept to a minimum, which will help keep the brake system in a solid state. 

Although brake fluid is quite a more expensive option than the ones we have listed here, it is still a top-notch quality brake fluid that is worth the cost. So, you may want to prepare a few bucks if you want to get this brake fluid in your garage. But it is worth every penny you splash on it.


Key Features

  • Anti-vapor lock feature
  • Higher boiling points
  • Higher braking in severe conditions
  • Expensive
  • Specifications above DOT 3 and 4

Best Brake Fluid Guide & FAQ

Brake fluid is an essential component of your car that enhances functionality and improves engine performance. If you fail to choose the right model, you may end up dampening the agility of your car engine and the overall delivery of the car while on the road.

It is why you shouldn’t compromise the need to have the best brake fluid added to your car’s braking system. But in choosing the best brake fluid, you must take into consideration some essential features. These features are critical to the overall work the fluid will perform in the braking system of your car.

Here are a few of the essential things you should look out for before buying brake fluid for your car:

Dot specification

This is one of the most important features to consider before going for any product. It is also a product that you cannot change or alter. The dot specification depends on the manufacturer’s specifications. If the vehicle manufacturer states that DOT4 should be used, then it will be unsafe to use DOT3.

Ability to mix well 

Another feature to consider is the brake fluid’s ability to mix well with other liquids. Getting brake fluid that can mix well with other liquids only means that you can top it up without having to completely drain it.


Before going for any brake fluid, you make sure that they are not corrosive to avoid damage to the paintwork of the vehicle. Corrosive fluid could damage the metal parts of your vehicle. Avoid any fluid that contains any bleaching agent. You can see that the models we have on our list here are all non-corrosive. You can pick any of them.

Water resistance

It is another feature to consider when going for any brake fluid. Since the pipes and tubes of the brake system contain rubber which is usually porous. The system will eventually allow water to penetrate the system.

Reasons your Brake Fluid Drops 

There are several reasons your brake fluid can drop in the master cylinder. You will only need to pay close attention to your engine and the entire vehicle. You must inspect your car engine’s brake fluid as often as possible. If the fluid in the master cylinder drops down a bit due to use, you can always top it off. 

Here are two top reasons your brake fluid may drop consistently:

Worn brake linings

A consistent reduction in reservoir fluid may require that you inspect to see if something is significantly wrong with your brake linings. If these linings are worn, the quantity of the brake fluid level in the master cylinder reservoir will drop, further leading to an extension of the wheel cylinder.


Another reason your brake fluid may consistently drop is the presence of leaks around your master cylinder. The cylinder may have some leaks in any part of its body. A leak will lead to your engine losing its hydraulic pressure. This way, your braking system will begin to lose its ability.

Frequently Asked Questions 

Do I need to worry about the kind of brake fluid I use?

It doesn’t matter what brake fluid you use, as long as you change it every two years. However, some brands like Honda sell their brake fluid and boast special lubricants present in the fluid meant to prolong the life of the brake system. 

Is synthetic brake fluid recommended? 

All brake fluids are synthetic in the sense that they all blend with other fluids. However, the synthetic label on most brands indicates that they are more moisture-resistant than others.

Can my brake fluid go bad?

Yes! Brake fluid can be defective. How? Brake fluid usually absorbs moisture, which in turn reduces its performance. This is why we recommend that you change your brake fluid every two years before it goes completely bad.

When the brake fluid goes bad, the best thing is to remove it from the master cylinder reservoir. However, you must be careful about how you go about this. Make sure you don’t wipe the brake fluid from the master cylinder. All you can do to remove brake fluid from its casing is to wash it with water.

What is the implication of not changing my brake fluid?

If you don’t change your brake fluid as recommended, it will lead to contamination in your brake reservoir as a result of the moisture that the brake fluid has absorbed.

Final Thoughts

Well, now that you have enough information on the different qualities of brake fluids available in the market, you can now make the right decision to select one for your vehicle.

Brake fluid is essential to the overall optimal performance of your vehicle. Brake fluids should not be played with as the lifespan of your brake system depends on it. We recommend that you get by all means the best brake fluid that is compatible with your vehicle.

Make sure you hire the services of a certified ASE technician to help you inspect any of the issues you find with your brake fluid. If the fluid decreases, you need to top it up when it drops, or you need to carry out routine braking system maintenance, make sure you have an ASE technician around you.

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